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    A psychophysical investigation of audio-visual timing in the millisecond range.

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    J.Hotchkiss final thesis 16 Feb 13.pdf (4.189Mb)
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    Publication date
    2013-12-18
    Author
    Hotchkiss, John
    Supervisor
    Whitaker, David J.
    Heron, James
    Keyword
    Time perception
    Channels
    Adaptation
    Duration
    Spatial frequency
    Temporal processing
    Millisecond range
    Audio-visual timing
    Rights
    Creative Commons License
    The University of Bradford theses are licenced under a Creative Commons Licence.
    Institution
    University of Bradford
    Department
    School of Optometry and Vision Science
    Awarded
    2012
    
    Metadata
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    Abstract
    The experiments described in this thesis use psychophysical techniques and human observers to investigate temporal processing in the millisecond range. The thesis contains five main sections. Introductory chapters provide a brief overview of the visual and auditory systems, before detailing our current understanding of duration processing. During the course of this review, several important questions are highlighted. The experiments detailed in Chapters 8-11 seek to address these questions using the psychophysical techniques outlined in Chapter 7. The results of these experiments increase our understanding of duration perception in several areas. Firstly, Experiments 1 and 2 (Chapter 8) highlight the role of low level stimulus features: even when equated for visibility stimuli of differing spatial frequency have different perceived durations. Secondly, a psychophysical hypothesis arising from the ¿duration channels¿ or ¿labelled lines¿ model of duration perception is given strong support by the adaptation experiments detailed in Chapter 9 and 10. Specifically, adaptation to durations of a fixed temporal extent induces repulsive duration aftereffects that are sensory specific and bandwidth limited around the adapted duration. Finally Chapter 11 describes the results of experiments designed to probe the processing hierarchy within duration perception by measuring the interdependency of illusions generated via duration adaptation and via multisensory cue combination. The results of these experiments demonstrate that duration adaptation is a relatively early component of temporal processing and is likely to be sub served by duration selective neurons situated in early sections of the visual and auditory systems.
    URI
    http://hdl.handle.net/10454/5771
    Type
    Thesis
    Qualification name
    PhD
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    Theses

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